Life of Planetary Nebulae Facts About Planetary Nebula Lesson Summary Register to view this lesson Are you a student or a teacher? I am a student I am a teacher Recommended Lessons and Courses for You Related Lessons Related Courses Planetary Nebula Definition, Features & Facts White Dwarf ...
Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. They have a relatively round compact appearance rather than the chaotic patchy shapes of other nebulae—hence their name, which was give
Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a...
Define planetary gear. planetary gear synonyms, planetary gear pronunciation, planetary gear translation, English dictionary definition of planetary gear. Noun 1. planetary gear - an outer gear that revolves about a central sun gear of an epicyclic train
Solar Nebula Chondrite Protoplanets Meteoroids Extrasolar Gas Giants Melting Point View all Topics Recommended publications Icarus Journal Planetary and Space Science Journal Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Journal Ad...
These generally represent those of the bulk solar nebula within which the planets formed, and provide the reference for consideration of terrestrial noble gases. Chondritic meteorites are rich in noble gases, and have long been considered as sources for terrestrial noble gases. While meteoritic gases...
Figure 1. Planetary gear train with negative gear ratio of the simple train: (a) single-row, (b) two-row; (z,) and (z4) sun gears, (z2) and (Zj) planets, (C) carrier of the automatic adjustment of the gears it is preferable to have three planets. The compactness and small we...
Observations of the Balmer decrement were used to obtain information about the internal structure on the doubleshell planetary nebula NGC 3242. Variations in the Balmer decrement are associated with reddening, self absorption, and changes in excitation mechanisms. Variations in the intensity line ratios...
would be part of the nebula formed by the blast. The heavier elements such as platinum, lead, and thorium may have come from the collision of stellar remnants such as neutron stars (Grossman2013). They too would likely be pure. Since that time, they have not undergone erosion or mixing ...
For example, the rock cores of the planets likely did not “settle” from an initially well-mixed planet, but instead the gaseous components likely collapsed onto a preexisting rocky nucleus that formed in the protosolar nebula. Since the EOS of all possible mixtures has not been studied, ...